mental case
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
An insane person; a nutcase.
Register: derogatory, slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “mental case” mean?
An insane person; a nutcase.
Is “mental case” formal or informal?
mental case is generally derogatory, slang.